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The Stata Journal
Volume 8 Number 1: pp. 79-104



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fuzzy: A program for performing qualitative comparative analyses (QCA) in Stata

Kyle C. Longest
Department of Sociology
University of North Carolina at Chapel Hill
Chapel Hill, NC
klongest@email.unc.edu
Stephen Vaisey
Department of Sociology
University of North Carolina at Chapel Hill
Chapel Hill, NC
Abstract.   Qualitative comparative analysis (QCA) is an increasingly popular analytic strategy, with applications to numerous empirical fields. This article briefly discusses the substantive motivation and technical details of QCA, as well as fuzzy-set QCA, followed by an in-depth discussion of how the new program fuzzy performs these techniques in Stata. An empirical example is presented that demonstrates the full suite of tools contained within fuzzy, including creating configurations, performing a series of statistical tests of the configurations, and reducing the identified configurations.
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View all articles with these keywords: fuzzy, cmvom, cnfgen, coincid, coverage, fzplot, mavmb, reduce, setgen, suffnec, truthtab, yavyb, yvn, yvo, yvv, yvy, qualitative comparative analysis, QCA, fuzzy sets, Boolean logic, Boolean data, postestimation command

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